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Reports any non-final field in a class with <b>@Immutable</b> annotation.
This violates the contract of the <b>@Immutable</b> annotation.
Supported <b>@GuardedBy</b> annotations are:
<ul>
  <li>net.jcip.annotations.GuardedBy</li>
  <li>javax.annotation.concurrent.GuardedBy</li>
  <li>org.apache.http.annotation.GuardedBy</li>
  <li>com.android.annotations.concurrency.GuardedBy</li>
  <li>androidx.annotation.GuardedBy</li>
  <li>com.google.errorprone.annotations.concurrent.GuardedBy</li>
</ul>
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